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Patented Aug. 30, I898. G. BOWBOTTOM.

D R 0 P H A M M E B (Application filed Mar. 27, 1897.)

2 Sheets-Sheet I.

(No Model.)

Int en tor:

Witnesses:

(6 & "PM

No. 609,836. Patented Aug. 30, [898.

G ROWBUTTDM DROP HAMMER.

(Appl c n in d m 27 1897) (No Model.) 2 Sheets-Sheet 2.

Witness es.-

Inventor:

m: ubngus versus w. homuwo. WASHIN Nrrn STATES GEORGE ROWBOTTOM, OFWATERBURY, CONNECTICUT, ASSIGNOR TO THE YVATERBURY FARREL FOUNDRY PLACE.

AND MACHINE COMPANY, OF SAME DROP-HAMMER.

SPECIFICATION forming part of Letters Patent No. 609,836, dated August30, 1898.

Application filed Math 27, 1897.

To all whom it may concern.-

Be it known that I, GEORGE RowBorToM, a citizen of the United States,residing at Waterbury, in the county of New Haven and State ofConnecticut, have invented a new and useful Improvement in Drop-Hammers,of which the following is a specification.

Myinvention relates to that class of power drop-hammers in which the ramor hammer during a portion of its upward stroke acts upon and opens thedriving-clutch, thereby releasing the ram, which drops by gravity; andthe object of my invention is to communicate from the ram, whatever itsvelocity may be, the necessary force and motion toopen the clutchwithout pounding. I attain this object by means of the mechanismillustrated in the accompanying drawings, forming part of thisspecification, in which- Figure 1 is a front elevation, and Fig. 2 aside elevation, of a drop-hammer embodying my invention. Fig. 3 is aside View of the ram, which is omitted in Fig. 2. Fig. 4 is aperspective view of my attachment removed from the frame of the machine,but showing a part of the ram. Figs. 5 and 6 represent variations in theconstruction of the reducing mechanism.

The drop-hammer shown in the drawings, aside from my improvements, is ofwell-known construction and operates in the usual way, as follows: Poweris transmitted through a pair of belt-driven friction-rolls which areadapted to clutch upon a lifting-strip S, suitably attached to the ramH, by which it is raised. An eccentrically-hung yoke, (supporting one ofthe rolls,) from an extending arm of which is suspended a rod R, adaptedby its weight to hold the rolls in forcible contact with thelifting-strip, constitutesa driving-clutch. To open the clutch and allowthe ram to drop, it is necessary to lift the rod R, which catches nearits base on a ledge 6 and rests there until knocked ofi by the fallinghammer at the bottom of its stroke. The means usually provided for thusknocking off the rod are an inclined cam 2 on the hammer and anadjustable dog 5 on the rod. Heretofore the rod has usually been liftedby direct impact of the hammer in its upward travel against a protrudingdog, which was adjusted Serial No. 629,506. on model.)

higher or lower on the rod, according to the length of stroke desired;but the suddenness of the impactcaused a pounding, which for variousreasons has been objected to and which my invention is intended toovercome.

The essential parts of my invention are a laterally-projecting cam 1 onthe edge of the ram, having an inclination to its vertical path of aboutten degrees, and a cam-follower C, swung from a pin 7, which extendsthrough one of several pin-holes in the side frame and supported in suchrelation to the path of the ram that in its upward travel the cam 1engages with the follower, which is thereby controllably moved. Theinclination given to the cam 1 may be more or less to produce thedesired relative motion in the follower, which transmits motion directto the clutch by con tact of the swinging segment C with an adjustabledog 3, attached to the rod R.

A small tension-spring 4 holds the dog and segment together, as shown.

The cam 1 should be curved slightly to en gage the follower at a tangentwhere they first come together. By this method there is nothing in thenature of a sudden blow imparted to any part ofthe clutch mechanism.

The construction shown in Fig. 5 is so similar to that shown in Fig. 4that it hardly requires any description, the only difierence being thatthe cam 1 operates a rocker 8 on one end of the pin 7, while the dog 3is in contact with an arm 9 on the other end of the pin, an arrangementequivalent to making a very wide face on the swinging segment C.

I am aware that it is old to raise the actuating-rod of a drop-hammer bya pivotallymounted lever which overlaps the front of the ram and isoperated by a projection upon the front side thereof, which raises thelever until one portion thereof is brought abruptly against a projectionon the lever, as illustrated in the patent to WVhitlock, No. 579,356,dated March 23, 1897, and I do not therefore claim such a construction,but limit myself to a construction wherein the lover or camfolloweroperates in front of the side frames by a cam upon the side of the ramand does not project over in front thereof and which allows the ram topass completely by it, if necessary.

WV hat I do claim, and desire to secure by Letters Patent, is-

1. In a drop-hammer comprising a base, side frames, one of which isprovided with a series of transverse pin-holes, a rain and its actuatingmechanism, the said ram provided with a laterally-projecting inclinedcam-surface, the combination therewith of a partiallyrotatablesector-cam, actuated by the cam upon the edge of the ram and adapted tobe mounted in said pin-holes and mechanism for operating theram-releasing mechanism adjustably secured thereto and operated by thesaid sector-cam, substantially as set forth.

2. In a drop-hammer comprising a base, side frames, through one ofwhichextends a plurality of pin-holes, a ram and its actuatingmechanism, the said ram having a cam upon one of its edges, thecombination therewith of a cam-follower actuated by the cam upon theedge of the ram, a dog having a depending arm adjustably secured to thesaid ram-actuating mechanism and a spring connection between the saidcam-follower and dog, substantially as set forth.

3. In a drop-hammer comprising a base, side frames, through one of whichextends a plurality of pin-holes, a ram and its actuating mechanism, thesaid ram provided with a cam upon one edge thereof, the combinationtherewith of the sector-cam follower 0 having a shank adapted to beinserted and operate Within the said pin-holes and actuated by the camupon the edge of the ram, dog 3 clamped to the actuating-rod R andhaving the spring 4 connecting it with the said cam-follower,substantially as set forth.

GEORGE ROWBOTTOM.

\Vitnesses:

DAVID C. GRIGGS, EDWARD -W. BROOK.

